<div class="panel {{panelClass || 'panel-default'}}">
  <div class="panel-heading">
    <h4 class="panel-title">
      <div class="accordion-toggle" ng-click="toggleOpen()" uib-accordion-transclude="heading">
        <span uib-accordion-header>
          {{heading}}
        </span>
      </div>
    </h4>
  </div>
  <div class="panel-collapse collapse" uib-collapse="!isOpen">
    <div class="panel-body" ng-transclude></div>
  </div>
</div>
